Help !determine the emprical formula of a compound w which had 34.2 of iron and 65.8 of chlorine cl35.5 fe56
Is that percent?
Take 100 g of material which will give you
34.2 g Fe
65.8 g Cl.
Convert to mols.
34.2/56 = about 0.6 (but get better number)
65.8/35.5 = about 2 (get better number).
Now find the ratio of each with the smaller number being 1.00. The easy way to do that is to divide the smaller number by itself, then divide the other number by the same small number.
Round to whole number. Post your work if you get stuck.
its in percentage(%)
To determine the empirical formula of a compound, we need to find the ratio of the elements present in the compound.
Step 1: Convert the given masses of iron and chlorine into moles.
The molar mass of iron (Fe) is 56 g/mol, and the molar mass of chlorine (Cl) is 35.5 g/mol. Using this information, we can calculate the moles of each element:
Moles of Fe = mass of Fe / molar mass of Fe
= 34.2 g / 56 g/mol
= 0.61 mol
Moles of Cl = mass of Cl / molar mass of Cl
= 65.8 g / 35.5 g/mol
= 1.85 mol
Step 2: Divide the moles of each element by the smallest number of moles.
The smallest number of moles in this case is 0.61 mol. Divide the moles of each element by 0.61 mol:
Moles of Fe = 0.61 mol / 0.61 mol
= 1 mol
Moles of Cl = 1.85 mol / 0.61 mol
≈ 3 mol
Step 3: Write the empirical formula using the mole ratios.
Since the ratio of Fe to Cl is 1:3, the empirical formula would be:
FeCl3
So, the empirical formula of the compound is FeCl3.
To determine the empirical formula of a compound using the given mass percentages, we need to follow certain steps:
Step 1: Convert the given mass percentages to moles:
- Calculate the moles of iron (Fe):
Moles of Fe = Mass of Fe / Molar mass of Fe
- Calculate the moles of chlorine (Cl):
Moles of Cl = Mass of Cl / Molar mass of Cl
To convert the mass percentages to moles, we need the molar masses of iron (Fe) and chlorine (Cl). Looking at the periodic table, we find:
- Molar mass of Fe = 56 g/mol
- Molar mass of Cl = 35.5 g/mol
Plugging in the values, we can calculate the moles of Fe and Cl:
- Moles of Fe = 34.2 g / 56 g/mol
- Moles of Cl = 65.8 g / 35.5 g/mol
Step 2: Determine the simplest mole ratio:
Divide both values of moles obtained in Step 1 by the smallest value among the two. This will give us the simplest mole ratio of the elements in the compound.
- Simplest mole ratio of Fe in the compound = Moles of Fe / Smallest mole value
- Simplest mole ratio of Cl in the compound = Moles of Cl / Smallest mole value
Step 3: Determine the empirical formula:
The simplest mole ratio obtained in Step 2 will give us the empirical formula. Round the values to the nearest whole number (or simplify if necessary).
The empirical formula of the compound can be written using the obtained mole ratios.